Health Monitoring in the Île-de-France Region. Bulletin of October 22, 2025.

Key Points

Chikungunya, dengue, Zika

Imported cases:

  • 213 dengue

  • 185 chikungunya

  • 1 Zika

Local cases:

  • 2 chikungunya

West Nile virus infections

  • 17 confirmed local human cases of West Nile

Bronchiolitis

  • At the hospital, the number of emergency room visits for bronchiolitis continued to rise. The number of hospitalizations following an emergency room visit was stabilizing.

  • In the city, indicators were on the rise.

  • Virology: Detection rates for RSV were rising at low levels; detection rates for rhinovirus were rising at high levels.

COVID-19

  • SOS Médecins: decrease in the number of cases for suspected COVID-19 among those aged 15–64 and stability in other age groups.

  • Emergency department visits: a decrease in the number of visits for suspected COVID-19 across all age groups.

  • Clusters of acute respiratory infections (ARI) in long-term care facilities (LTCFs): a decrease in the number of reported COVID-19 clusters by LTCFs in Île-de-France was recorded in S41 (the week when symptoms of the first case appeared); however, the data are incomplete and still likely to increase.

  • SARS-CoV-2 in wastewater: Data from Week 42 indicate a continued decline in SARS-CoV-2 circulation in wastewater in Île-de-France, following several weeks of increased virus detection

Influenza

  • In hospitals Activity related to influenza and influenza-like illnesses remained stable at a baseline level.

  • In the community, indicators were on the rise.

  • Virology: The number of confirmed influenza virus infections remained low.

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